Driver and extractor for stud bolts and the like



Nov. 22, 1949 A. s. F. RANDOLPH 2,433,933

DRIVER AND EXTRACTOR FOR STUD BOLTS AND THE LIKE Filed July 9, 1947 2Sheets-Sheet 1 INVENTOR.

Wkly

Nov. 22, 1949 Ays F. RANDOLPH 2,438,933

DRIVER AND EXTRACTOR FOR STUD BOLTS AND THE LIKE Filed July 9, 1947 2Sheets-Sheet 2 Patented Nov. 22, 1 949 DRIVER AND EXTRACTOR FOR STUDBOLTS AND THE LIKE Andrew S. F. Randolph, Westfield, N. J. ApplicationJuly 9, 1947, Serial No. 759,745

9 Claims.

This invention relates to means for driving and removin threaded orunthreaded studs or taps, and more particularly to means used inconnection with such taps and studs for driving and proved means of thetype described times can be manipulated to either drive and seat thestud therefrom.

Another object of this invention is to provide a tool which will drive astud or operate a tap to depth being preset cessory parts.

Another object of this invention is to provide a tool which is readilyadaptable for either manual or machine use interchangeably.

tool out of adjustment.

Further objects and advantages of this invention will be apparent fromthe accompany- In the said drawings, in which preferred embodiments ofthe invention are illustrated:

Fig. 1 is an elevational view of the tool showing a stud bein driveninto stock;

Fig. 2 is a view partly in vertical section and partly in elevation of atool constructed in accordance with this invention;

Fig. 3 is a sectional view of the head of the tool showing the method oflocking the head to the main body by means of the handles or by means ofthe set screws;

Fig. 4 is a horizontal partly sectional view of Fig. 3 taken on thelines l4 of Figs. 2 and 3, showing the method of locking the head of thetool to the main body by means of either handles or the set screws;

Figs. 5 and 6 are horizontal cross section views of the tool taken onthe lines 55 and 6-6 respectively of Fig. 2;

Figs. '7 and 8 are elevations of two different types of collets whichmay be used in the invention;

Figs. 9, 10 and 11 are side, front and top eleval5 is cut away at 33tions respectively of the shift lock of this invention.

7 as shown in Figs. 2, 3 and 4, and threaded holes are cut in the sidesat l6 and I! to accommodate complementary threaded handle bars I8 andi9. Smaller threaded holes 28 and 2i are drilled in the head l5 as shownin Fig. 4 and set-screws 22 and 23 inserted therein, so that the head 55may the screw bolt 1 independently of the holding action of the handlebars l8 and I9.

The upper section of the barrel I is slotted at 2 3 and the lowersection of the head 15 is correspondingly slotted at 25 to accommodatethe shift control 26. The upper portion of the screw threaded cylinder 6is preferably slotted at 6* in such a manner that when shift control 26is serted in slot 6 6 of 6 is just out of contact with the top surfaceAs shown in Figs. 9, 10 and 11 the shift control 26 is a bar 27 and knob28 preferably made in one piece, the knob 28 being serrated at 29 fornon-slip finger-tip operation. The bar 34 for frictional engagement withthe threaded cylinder 6.

A segment of the top of the barrel l is cut away at 32 while a segmentof the bottom of the head leaving a projection 34 so that the twosections interlock allowing head l5 to rotate only within the limit ofthe slot 32, and thus making a stop pin of 34.

In the drawings, Figure 8 represents a different type of collet whichmay be used with this invention. Instead of a threaded interior sectionthe collet of Figure 8 has vertical serrations indicated at 3! in itsinterior. The purpose of these vertical serrations is to grip anon-threaded stud or tap enabling the operator to insert or remove it;for example, studs in which the threaded portion has broken off orbecome so rusted or corroded that no definite working threads exist.

In operation, the head It? of the tool is removed and the screw bolt 1rotated either clockwise or counter-clockwise until with the collet pin9 is in a restricted position in the collet 9 and until there is therequired stud length observed in the threaded collet opening. The head iis now replaced on the screw bolt 1 and the handle bars 13 and i9rotated until they grasp firmly the said screw bolt 2. If the handles l8and 19 are not to be used the small screws 22 and 23 are tightened. Inthis connection it will be noted hat the upper section of the screw bolt3 does not entirely fill the cavity in the head l5, so that an extensionrod may be inserted therein for operation of the tool.

With the head locked in place and the shift control 26 in the upposition, the left hand screw bolt 1 and the right hand screw threadedcylinder 6 are locked together through the driving head !5. A stud isnow screwed into the collet 9 until its head meets the base of thecollet pin 9. The drive head is now turned to the right, or clockwise,by use of the handle bars l8 and i9. As the drive head 15 is turned theprojection 35 will strike the end of slot 32 at the top of barrel lchecking further relative rotary movement. Meanwhile rotation of thedrive head I?) has rotated the cylinder 6 within the barrel 1 so thatthe drive face 8 on the end of the screw bolt 1 comes into contact withthe head of the collet pin 9 Any further rotation of the drive head willforce collet 9 down into taper 13 of barrel l and tighten the threads ofcollet 9 around the stud threads until the pitch diameters oi the colletthreads and the stud threads coincide, and the stud may then be easilydriven into a casting to the desired depth.

In order to release the tool from the stud, rotation in acounter-clockwise direction is all that is required as suchcounter-clockwise rotation will turn as a unit the drive head 15, righthand screw cylinder 5 and left hand screw bolt 1 allowing these units torise slightly in barrel l thus relieving pressure on the collet pin 8and releasing collet 9 from taper l3 which releases the hold of thecollet threads on the stud threads and allows easy removal of the tool.

In order to remove a stud with the tool the shift control 26 is shiftedto its down position in the slot 25 thus unlocking 6 and 1. The tool isthen screwed down on the threaded stud until the top of the stud abutsthe base of the collet pin 9 The shift control 26 being in a downposition the right-hand-screw cylinder 6 and barrel l are lockedtogether and left-hand-screw bolt 1 is free to rotate. Further turningof the driver head will drive the collet 9 into the taper of the barrell and tighten the collet around the threads of the stud E2. The pressureon the handles it and i8 is now reversed to a counterclockwise directionwhich applies additional pressure on the collet pin 9 through the screwbolt face 8 thereby forcing collet 9 further into'the taper of barrel Iand tightening the collet on the screw thread of stud 12. The pressurethus applied to the handles 18 and i9 is thus built up through the screwbolt I, collet pin 9 and collet 9 until a point is reached where thepressure and rotation of the collet seizure is equal to the seizure ofthe lower thread of the stud l2, in its tapped hole in the casting.

To remove the stud from the tool it is only necessary to place thenut-like portion 2 of the barrel I in a vise or similar device and turnhandles it and I9 clockwise until lug 34 strikes the shoulder of segment32. This moves slots 25, 25 into alignment so that said shiit control 26may be moved into its up position. Rotation of the drive head [5 incounter-clockwise direction will then release the pressure on the collet9 and the stud may be removed with a twisting motion of the fingers.

By use of the collet shown in Fig. 8, it is possible to remove damagedor broken taps. It is also possible to remove studs which for one reasonor another have no threads at all, or no service able threads on theirexposed portion. After the tool has been adjusted for a stud having agiven projection successive studs having the same projection may bedriven or removed without removing the tool head.

It will be seen by the foregoing that the improvements provide a devicewhich can be" employed for both driving and removing studs and the lilacwithout requiring the use of accessory wrenches or other tools, thegripping pressure of the collet building up automatically in directproportion to the torque required to break the stud away from itscasing; that they provide within the device an adjustment for receivingthe stud to the desired depth, the removal of the driving head allowingthe left-hand screw to be turned in or out to retract or advance thecollet pin so that, inter alia, all studs may be driven to uniform depthand studs may be removed where only a few threads may be held; that thedevice may be used in places where cross handles cannot be used bysimply inserting a standard extension, universal, ratchet or otherconnecting member in the square breach of the head for either power ofhand driving; that collets may be changed without danger of throwing thedevice out of adjustment, each tool accepting three collets of dificrentsize; and that the semi-sealed construction confines the lubrication andexeludes grit or dust Other uses and advantages will be aparent to thoseskilled in the art;

Various changes in the details of construction of the exemplaryembodiment herein described and shown may be made without departing fromthe scope of the invention as defined by the appended claims.

What I claim is:

1. In a device of the character described, a eontractilele colletadapted when contracted to engage a stud, bolt or the like and to gripthe same, a hollow member in which said collet is removably mounted forlongitudinal movement,

said collet and member having inclined surfaces adapted to engage eachother to contract and permit expansion of the former, a member mountedto move lon itudinally in the interior of said collet and to bearagainst said stud, belt or the like to cause it to move lengthwise whilesaid surfaces are in engagement, a bar having a screw thread on aportion of it and a sleeve-like member having an internal complementalengaging screw thread within which said bar is located, the last twoparts being located within the hollow member and the said hollow memberand sleeve-like member having respecand counter-clockwise and releasablemeans for connecting the head and the sleeve-like member, wherebyrotation of the head in one direction causes the bar to press againstthe member in the collet and cause the same to grip a stud and to rotateit in unscrewing direction and rotation of the head in the oppositedirection when the sleeve-like member is connected therewith causes thesame gripping action and a driving or screwing up rotation of a stud.

2. In a device of the character described, a contractible colletprovided with an internal screw thread at its outer portion and adaptedwhen contracted to engage a stud, bolt or the like having a complementalscrew thread on its exterior and to grip the same, a hollow member inwhich said collet is removably mounted for wise and releasable means forconnecting the head and the sleeve-like member, whereby roor the like tocause it to said surfaces are in engagement, a bar having a screw threadon a portion of it and a sleeve-like member having an internalcomplemental engaging screw thread move lengthwise while sleeve-likemember having an internal within which said bar is located, the last twoparts being located within the hollow member and the said hollow memberand sleeve-like member having respective internal and externalcomplemental screw threads pitched reversely to the threads of the barand the internal threads of the sleeve-like member, a hollow drivinghead mounted at one end of the said hollow member, and receiving anouter portion of the bar, means for securing said head to the bar andfor rotatand counter-clockwise and releasable means for connecting thehead and the sleeve-like member, whereby rotation of the head in onedirection causes the bar to press against the member in the collet andcause the same to grip a stud and to rotate it in unscrewing directionand rotation of the head in the opposite direction when the sleeve-likemember is connected therewith causes the same gripping action and adriving or screwing up rotation of a stud.

4. In a device of the character described, a contractible collet adaptedwhen contracted to engage a stud, bolt or the like and to grip the same,a hollow member in which said collet is removably for free longitudinalmovement, said or the like to cause it to move lengthwise while saidsurfaces are in engagement, a bar having a screw thread on a portion ofit and a complethread Within which said bar is located, the last twoparts being located within the hollow member and the said hollow memberand sleeve-like member having respecmental engaging screw ing uprotation of a stud said means for connectand sleeve-like membercomprising of the recess of the other.

5. In a device portions are in engagement, a bar, a screw threadsaid barand a sleeve-like member said bar is located,

hollow member, an internal screw thread in assess-s said sleeve-likemember complemental to the thread of the bar, respective internal andexternal complemental screw threads on the hollow member and sleeve-likemember pitched reversel'y to the threads of the bar and the internalthreads of the sleeve-like member, a driving head mounted on the. saidhollow member and receiving an outer portion of the said bar, means forseeming said head to the bar and means for rotating both clockwise andcounter-clockwise, and releasable means for connecting and disconnectingthe head and the sleeve-like member, whereby rotation of the head in onedirection causes the bar to press against the member in the collet andcause the same to grip a stud and to rotate it in unscrewing directionand rotation of the head in the opposite direction when the sleeve-likemember is connected therewith causes the same gripping action and adriving rotation of a stud.

6. A device as set forth in claim 5, in which said means for connectingthe head and sleevelike member comprise alignable recesses with whichthey are provided and a slidable member mounted on one and movable intoand out of the recess of the other.

7. A device as set forth in claim 5 in which said sleeve-like member isin all positions out of actual contact with the collet.

8. A device as set forth in claim 5 in which the member mounted to movein the collet is unsecured thereto.

9. A device as set forth in claim 5' in which the said bar is mounted tobear directly against the said member in the collet.

ANDREW S. F.v RANDOLPH. I

REFERENCES CITED The. following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,257,089 Caminez Sept. 30, 19412,334,088 Haas et a1 Nov. 9, 1943 2,435,137 Geertsema Jan. 2'7, 1948FOREIGN PATENTS Number Country Date 284,459 Germany June 1, 1,915

